CODEWITHSUNDEEP
node.jsasynchronousloopbackjs
hownowbrowncow
hownowbrowncow

Reputation: 475

loopback model validation failures (asynchronous behavior)

I'm trying to validate a model and it's contents. However, because of the structure of loopbacks custom validation functions it's quite difficult to program more advanced logic than simple string validation.

Job.validate('job_definition, function(err){
    //err();
    //this will succeed in throwing error
    Job.app.models.anotherModel.findOne({where:{name:this.job_definition.toolName}}, function(error, tool){
      if(tool.aProperty === this.job_definition.aProperty){
          //err();
          //this will not succeed, validation script will exit before err() is thrown
      }
    });
}, {message: 'this is malformed'});

How can I get this validation function to 'wait' before exiting?

Upvotes: 1

Views: 674

Answers (1)

Raymond Camden
Raymond Camden

Reputation: 10857

Here is an example using validateAsync (https://apidocs.strongloop.com/loopback-datasource-juggler/#validatable-validateasync). Note that you have to run err() when you want to fail validation.

module.exports = function(Person) {

    function myCustom(err, done) {
        console.log('async validate');
        var name = this.name;
        setTimeout(function() {
            if(name == 'Ray') {
                err();
                done();
            } else {
                done();
            }

        }, 1000);   
    }

    Person.validateAsync('name', myCustom, {message:'Dont like'});

};

Does this make sense? FYI, I could rewrite that if a bit nicer.

Upvotes: 3

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